Effect of Silicon on the Corrosion Behavior of Powder-Processed Phosphoric Irons

Yashwant Mehta, Shefali Trivedi, K. Chandra, P.S. Mishra

Indian Institute of Technology, Roorkee- 247667, Uttarakhand, India.

DOI: 10.4236/jmmce.2010.910062                

Abstract

The corrosion behaviour of phosphoric irons (i.e. Fe-P alloys containing low phosphorous in the range 0.1 to 0.7 wt. % ) containing chromium with/without addition of silicon, prepared by powder forging route was studied in different environments. The various environments chosen were acidic (0.25 M H₂SO₄ solution of pH 0.6), neutral/marine (3.5 % NaCl solution of pH 6.8) and alkaline (0.5M Na₂CO₃ + 1.0 M NaHCO₃ solution of pH 9.4). The corrosion studies were conducted using Tafel Extrapolation and Linear Polarization techniques. The studies compare electrolytic Armco iron with phosphoric irons. It was observed that silicon improved the resistance to corrosion in all the environments. Corrosion rates were higher in acid medium, minimal in alkaline medium and low in neutral solution.

Keywords

Phosphoric Iron, Corrosion, Powder Metallurgy, Forging, Ancient iron.

Conflicts of Interest

The authors declare no conflicts of interest.

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